U.S. patent application number 14/369812 was filed with the patent office on 2015-01-29 for lever device and a fuel injection valve.
The applicant listed for this patent is Roland Feigi, Hellmut Freudenberg, Manuel Hannich, Stefan Kohn, Robert Kuchler, Stefan Lehmann, Wolfgang Wechler, Matthias Wicke. Invention is credited to Roland Feigi, Hellmut Freudenberg, Manuel Hannich, Stefan Kohn, Robert Kuchler, Stefan Lehmann, Wolfgang Wechler, Matthias Wicke.
Application Number | 20150028135 14/369812 |
Document ID | / |
Family ID | 47557068 |
Filed Date | 2015-01-29 |
United States Patent
Application |
20150028135 |
Kind Code |
A1 |
Lehmann; Stefan ; et
al. |
January 29, 2015 |
Lever Device and a Fuel Injection Valve
Abstract
A lever device for a fuel injection valve includes a housing
with a housing recess, at least one lever element arranged in the
housing recess, a drive element arranged in the housing recess and
coupled to the lever element(s) in order to act upon said at least
one lever element in a direction of a force-action axis, and an
output element arranged in the housing recess and coupled to the
lever element(s) such that this output element is moveable in the
force-action axis direction by the at least one lever element. Each
lever element includes a coupling section designed or arranged such
that the lever element is coupled to the housing, or to the output
element, in a rotationally-fixed manner with respect to the
force-action axis.
Inventors: |
Lehmann; Stefan;
(Lappersdorf, DE) ; Freudenberg; Hellmut;
(Pentling/Grossberg, DE) ; Kohn; Stefan;
(Hohenburg, DE) ; Kuchler; Robert; (Regen, DE)
; Hannich; Manuel; (Regensburg, DE) ; Feigi;
Roland; (Regensburg, DE) ; Wechler; Wolfgang;
(Regensburg, DE) ; Wicke; Matthias;
(Wernberg-Koeblitz, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Lehmann; Stefan
Freudenberg; Hellmut
Kohn; Stefan
Kuchler; Robert
Hannich; Manuel
Feigi; Roland
Wechler; Wolfgang
Wicke; Matthias |
Lappersdorf
Pentling/Grossberg
Hohenburg
Regen
Regensburg
Regensburg
Regensburg
Wernberg-Koeblitz |
|
DE
DE
DE
DE
DE
DE
DE
DE |
|
|
Family ID: |
47557068 |
Appl. No.: |
14/369812 |
Filed: |
December 19, 2012 |
PCT Filed: |
December 19, 2012 |
PCT NO: |
PCT/EP2012/076183 |
371 Date: |
June 30, 2014 |
Current U.S.
Class: |
239/584 ;
251/231 |
Current CPC
Class: |
F02M 61/10 20130101;
F02M 2200/702 20130101; F02M 61/168 20130101; F02M 51/0603
20130101; F02M 63/0026 20130101 |
Class at
Publication: |
239/584 ;
251/231 |
International
Class: |
F02M 51/06 20060101
F02M051/06; F02M 61/10 20060101 F02M061/10 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 30, 2011 |
DE |
102011090196.5 |
Claims
1. A lever device for an injection valve, the lever device
comprising: a housing having a housing recess, at least one lever
element arranged in the housing recess, a drive element arranged in
the housing recess and coupled to the at least one lever element
for acting on the at least one lever element in a direction of a
force action axis, and an output element arranged in the housing
recess and coupled to the at least one lever element such that the
output element is moveable in the direction of the force action
axis by the at least one lever element, wherein each of the at
least one lever element comprises a coupling section configured or
arranged such that the at least one lever element is fixedly
coupled to the housing or to the output element such that at least
one lever element rotates with the housing or the output element
around the force action axis.
2. The lever device of claim 1, wherein the coupling section of
each lever element comprises a planar wall section that interacts
with a corresponding planar wall section of the output element such
that each lever element is fixedly coupled to the output element
such that each lever element rotates with the output element around
the force action axis.
3. The lever device of claim 1, wherein the coupling section of
each lever element comprises a planar wall section that interacts
with a corresponding planar wall section of the housing recess such
that each lever element is fixedly coupled to the housing such that
each lever element rotates with the housing around the force action
axis.
4. The lever device of claim 1, wherein: the coupling section of
each lever element comprises a recess, and the housing comprises a
pin arranged in the recess of the coupling section of each lever
element such that the each lever element is fixedly coupled to the
housing fixedly such that each lever element rotates with the
housing around the force action axis.
5. (canceled)
6. The lever device of claim 4, wherein the pin extends parallel to
the force action axis.
7. The lever device of claim 1, comprising a first lever element
and a second lever element, wherein the coupling section of the
first lever element comprises a first planar wall section, and the
coupling section of the second lever element comprises a second
planar wall section that is co-planar with the first planar wall
section of the first lever element.
8. The lever device of claim 1, wherein the coupling section of
each lever element comprises a pair of planar wall sections on
opposite sides of the respective lever element.
9. An injection valve, comprising: a lever device comprising: a
housing having a housing recess, at least one lever element
arranged in the housing recess, a drive element arranged in the
housing recess and coupled to the at least one lever element for
acting on the at least one lever element in a direction of a force
action axis, and an output element arranged in the housing recess
and coupled to the at least one lever element such that the output
element is moveable in the direction of the force action axis by
the at least one lever element, wherein each of the at least one
lever element comprises a coupling section configured or arranged
such that the at least one lever element is fixedly coupled to the
housing or to the output element such that at least one lever
element rotates with the housing or the output element around the
force action axis, a valve needle coupled to or defining the output
element, wherein the drive element of the lever device and the
valve needle are coupled to each another such that, based on an
actuating signal, the valve needle prevents a fluid flow through
the injection valve in a closed position of the valve needle and
releases a fluid flow through the injection valve in other
positions of the valve needle.
10. The injection valve of claim 9, wherein the coupling section of
each lever element of the lever device comprises a planar wall
section that interacts with a corresponding planar wall section of
the output element such that each lever element is fixedly coupled
to the output element such that each lever element rotates with the
output element around the force action axis.
11. The injection valve of claim 9, wherein the coupling section of
each lever element of the lever device comprises a planar wall
section that interacts with a corresponding planar wall section of
the housing recess such that each lever element is fixedly coupled
to the housing such that each lever element rotates with the
housing around the force action axis.
12. The injection valve of claim 9, wherein: the coupling section
of each lever element of the lever device comprises a recess, and
the housing comprises a pin arranged in the recess of the coupling
section of each lever element such that the each lever element is
fixedly coupled to the housing fixedly such that each lever element
rotates with the housing around the force action axis.
13. The injection valve of claim 12, wherein each pin extends
parallel to the force action axis.
14. The injection valve of claim 9, wherein the lever device
comprises a first lever element and a second lever element, wherein
the coupling section of the first lever element comprises a first
planar wall section, and the coupling section of the second lever
element comprises a second planar wall section that is co-planar
with the first planar wall section of the first lever element.
15. The injection valve of claim 9, wherein the coupling section of
each lever element of the lever device comprises a pair of planar
wall sections on opposite sides of the respective lever element.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a U.S. National Stage Application of
International Application No. PCT/EP2012/076183 filed Dec. 19,
2012, which designates the United States of America, and claims
priority to DE Application No. 10 2011 090 196.5 filed Dec. 30,
2011, the contents of which are hereby incorporated by reference in
their entirety.
TECHNICAL FIELD
[0002] The invention relates to a lever device for an injection
valve having a housing, at least one lever element, a drive element
and an output element. Furthermore, the invention relates to an
injection valve for an internal combustion engine of a motor
vehicle, which injection valve has the lever device and a valve
needle which is coupled to the output element or which forms the
output element.
BACKGROUND
[0003] Injection valves for an internal combustion engine of a
motor vehicle can have actuators which are configured, in
particular, as piezo-electric actuators. Actuators of this type
have a piezo-ceramic material. Actuators of this type can change
their longitudinal extent depending on an electric field which acts
in the piezo-ceramic material. Furthermore, a lever device can be
provided which transmits the stroke of the actuator.
[0004] Piezo-electric actuators which are used as actuating
members, in particular in injection valves for internal combustion
engines in motor vehicles, are arranged in a housing in such a way
that a stroke movement can be performed in the axial direction.
SUMMARY
[0005] One embodiment provides a lever device for an injection
valve, the lever device comprising a housing having a housing
recess, at least one lever element arranged in the housing recess,
a drive element arranged in the housing recess and coupled to the
at least one lever element for acting on the at least one lever
element in a direction of a force action axis, and an output
element arranged in the housing recess and coupled to the at least
one lever element such that the output element is moveable in the
direction of the force action axis by the at least one lever
element, wherein each of the at least one lever element comprises a
coupling section configured or arranged such that the at least one
lever element is fixedly coupled to the housing or to the output
element such that at least one lever element rotates with the
housing or the output element around the force action axis.
[0006] In a further embodiment, the coupling section of each lever
element comprises a planar wall section that interacts with a
corresponding planar wall section of the output element such that
each lever element is fixedly coupled to the output element such
that each lever element rotates with the output element around the
force action axis.
[0007] In a further embodiment, the coupling section of each lever
element comprises a planar wall section that interacts with a
corresponding planar wall section of the housing recess such that
each lever element is fixedly coupled to the housing such that each
lever element rotates with the housing around the force action
axis.
[0008] In a further embodiment, the coupling section of each lever
element comprises a recess, and the housing comprises a pin
arranged in the recess of the coupling section of each lever
element such that the each lever element is fixedly coupled to the
housing fixedly such that each lever element rotates with the
housing around the force action axis.
[0009] Another embodiment provides an injection valve, comprising a
lever device a disclosed above, and a valve needle coupled to or
defining the output element, wherein the drive element of the lever
device and the valve needle are coupled to each another such that,
based on an actuating signal, the valve needle prevents a fluid
flow through the injection valve in a closed position of the valve
needle and releases a fluid flow through the injection valve in
other positions of the valve needle.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Example embodiments of the invention are explained below
with reference to the drawings, in which:
[0011] FIG. 1 shows a diagrammatic illustration of an injection
valve,
[0012] FIG. 2 shows a cross section through a lever device in a
first embodiment,
[0013] FIG. 3 shows a cross section through a lever device in a
further embodiment,
[0014] FIG. 4 shows a cross section through a lever device in a
further embodiment, and
[0015] FIG. 5 shows a further cross section through the lever
device of the embodiment from FIG. 4.
DETAILED DESCRIPTION
[0016] Embodiments of the invention to provide a lever device for
an injection valve which has long-term reliability. Other
embodiments provide an injection valve which has a long service
life.
[0017] Some embodiments provide a lever device for an injection
valve, having a housing which has a housing recess, at least one
lever element which is arranged in the housing recess, a drive
element which is arranged in the housing recess and is coupled to
the at least one lever element for acting on the at least one lever
element in the direction of a force action axis, and an output
element which is arranged in the housing recess. The output element
is coupled to the at least one lever element in such a way that the
output element can be moved in the direction of the force action
axis by means of the at least one lever element. The at least one
lever element has a coupling section which is configured or
arranged in such a way that the at least one lever element is
coupled to the housing or the output element fixedly so as to
rotate with it with regard to the force action axis.
[0018] The at least one lever element is fixed rotationally with
respect to the housing or the output element with regard to the
force action axis.
[0019] This has the advantage that the at least one lever element
is prevented from performing a rotational movement with respect to
the housing or the output element, as a result of which changes in
the injection quantities can be avoided which can be produced as a
result of a rotational movement of this type of the at least one
lever element. The at least one lever element is thus positioned
reliably with respect to the housing or the output element. As a
result, long-term reliable operation of the lever device can be
made possible.
[0020] In one embodiment, the coupling section of the lever element
has a planar wall section, and the output element has a planar wall
section. The planar wall section of the lever element interacts
with the planar wall section of the output element in such a way
that the at least one lever element is coupled to the output
element fixedly so as to rotate with it with regard to the force
action axis.
[0021] The planar wall section of the lever element and the planar
wall section of the output element are, in particular, planar in a
plane which is approximately plane-parallel to the force action
axis.
[0022] This has the advantage that the planar wall sections of the
lever element and the output element can be realized particularly
simply in terms of manufacturing technology. The lever element and
the output element can therefore be manufactured in a very simple
and reliable way. Furthermore, a rotational movement of the lever
element with respect to the output element can be prevented
reliably.
[0023] In a further embodiment, the coupling section of the lever
element has a planar wall section, and the housing recess has a
planar wall section. The planar wall section of the lever element
interacts with the planar wall section of the housing recess in
such a way that the at least one lever element is coupled to the
housing fixedly so as to rotate with it with regard to the force
action axis.
[0024] The planar wall section of the lever element and the planar
wall section of the housing recess are, in particular, planar in a
plane which is approximately plane-parallel with respect to the
force action axis.
[0025] This has the advantage that the lever element and the
housing can be manufactured in a very simple way. Furthermore, a
rotational movement of the lever element with respect to the
housing can be prevented reliably.
[0026] In a further embodiment, the coupling section of the lever
element has a recess, and the housing has a pin. The pin is
arranged in the recess of the coupling section of the lever element
in such a way that the at least one lever element is coupled to the
housing fixedly so as to rotate with it with regard to the force
action axis. This has the advantage that a rotational movement of
the lever element with respect to the housing can thus be prevented
particularly reliably.
[0027] Other embodiments provide an injection valve which comprises
the lever device and a valve needle. The valve needle is coupled to
the output element or forms the output element. The drive element
and the valve needle are coupled to one another via the lever
device in such a way that, depending on an actuating signal, the
valve needle prevents a fluid flow through the injection valve in a
closed position and otherwise releases said fluid flow. A valve of
this type can be operated with long-term reliability on account of
the coupling of the lever element with respect to the housing or
the valve needle.
[0028] FIG. 1 shows a valve, in particular an injection valve 10
for an internal combustion engine in a motor vehicle.
[0029] The injection valve 10 has a housing 12. The housing 12 has
a shim 12a which is arranged between two tubular sections 12b of
the housing 12. The shim 12a and the two tubular sections 12b are
coupled fixedly to one another and together form the housing 12. A
housing recess 14 with a fluid inlet 16 and a fluid outlet 18 is
formed in the housing 12. Fuel can be fed to the injection valve 10
in the region of the fluid inlet 16 via a connector (not shown)
which is coupled hydraulically to the housing recess 14.
[0030] A valve needle 20 is arranged axially movably in the housing
recess 14, which valve needle 20 closes an injection nozzle 22 in a
closed position and otherwise makes a fuel flow through the
injection nozzle 22 possible.
[0031] The injection valve 10 comprises a piezo-electric actuator
24. Instead of the piezo-electric actuator 24, another actuator can
also be provided, for example a magnetostrictive actuator or an
electromagnetic actuator.
[0032] Furthermore, the injection valve 10 comprises a drive
element 26 which is coupled to the actuator 24. The drive element
26 preferably has a pin or rod which transmits the stroke and a
drive force of the actuator 24. The actuator 24 and the drive
element 26 are coupled to one another in the axial direction. The
stroke of the drive element 26 is dependent on an axial extent of
the piezo-electric actuator 24, which axial extent is dependent on
an actuating signal which can be fed to the piezo-electric actuator
24. Furthermore, the drive element 26 comprises a preferably
bell-shaped structural element 27.
[0033] Furthermore, a lever device 28 is arranged in the housing
recess 14 of the injection valve 10. The lever device 28 comprises
the drive element 26 and a lever element 30 or a plurality of lever
elements 30. In the embodiments which are shown, the lever device
28 has two lever elements 30. The lever elements 30 are coupled to
the drive element 26. Furthermore, the lever elements 30 are
coupled to an output element 32. The output element 32 is arranged
in the housing recess 14. The output element 32 is preferably
coupled to the valve needle 20. The valve needle 20 can also form
the output element 32. The drive element 26, the lever element 30
and the output element 32 interact in such a way that the stroke of
the drive element 26 is transmitted to the valve needle 20, and
that the valve needle 20 is therefore moved into its closed
position or into an open position.
[0034] The force action axis A of a drive force of the drive
element 26 runs through the drive element 26 and, furthermore, as a
force action axis of an output force, through the output element
32. In further embodiments, the force action axis through the drive
element 26 is offset with respect to the force action axis through
the output element 32.
[0035] FIG. 2 shows a first embodiment of the lever device 28 in a
cross section.
[0036] The lever elements 30 have in each case one coupling section
34. In the embodiment which is shown in FIG. 2, the output element
32 has two planar wall sections 36. The planar wall sections 36 lie
opposite one another with regard to the force action axis A of the
output element 32. Furthermore, the coupling sections 34 of the
lever elements 30 have in each case one planar wall section 38. The
planar wall sections 38 of the lever elements 30 are assigned to
the planar wall sections 36 of the output element 32. In each case
one of the planar wall sections 38 of the lever element 30 lies
opposite the planar wall section 36 of the output element 32. The
planar wall sections 36 of the output element 32 therefore interact
with the planar wall sections 38 of the lever element 30, and
therefore make it possible that the lever elements 30 are coupled
to the output element 32 fixedly so as to rotate with it with
regard to the force action axis A. It can therefore be achieved
that the lever elements 30 can no longer rotate with respect to the
valve needle 20. The conditions during the injection of the
injection valve 10 can therefore also be kept constant over a large
number of injection operations.
[0037] In the embodiment of the lever device 28 which is shown in
FIG. 3, the coupling sections 34 of the lever elements 30 have
planar wall sections 38. The housing recess 14 of the housing 12
has two planar wall sections 40 which lie opposite one another with
regard to the force action axis A. In each case one of the planar
wall sections 38 of one of the lever elements 30 interacts with one
of the planar wall sections 40 of the housing recess 14. As a
result, it can be achieved that the lever element 30 is coupled to
the housing 12 fixedly so as to rotate with it with regard to the
force action axis A. As a result of the fixed coupling of the lever
elements 30 to the housing 12 so as to rotate with it, it is
possible that the contact conditions between the lever elements 30
and the housing 12 can be kept constant over a long time period.
The injection behavior of the injection valve 10 can therefore also
be kept constant over a long time period.
[0038] In the embodiment which is shown in FIGS. 4 and 5, holes are
arranged in the shim 12a of the housing 12. The holes are
configured, in particular, as blind holes. Pins 42 are arranged in
the holes.
[0039] The coupling sections 34 of the lever elements 30 have in
each case one recess 44. The pins 42 engage into the recesses 44 of
the coupling sections 34 of the lever elements 30. It can therefore
be achieved that the lever elements 30 are coupled to the shim 12a
of the housing 12 fixedly so as to rotate with it with regard to
the force action axis A.
[0040] As a result of the fixed coupling between the lever elements
30 and the housing 12 so as to rotate together, it can be achieved
that the lever elements 30 can assume a fixed position with respect
to the housing 12 even over a multiplicity of injection operations.
As a result, stable injection conditions of the injection valve 10
can be achieved even over a multiplicity of injection operations of
the injection valve 10. It can be achieved as a result that
component tolerances have only a minor effect on the injection
quantities of the injection valve 10.
* * * * *